From: Marek Olšák <marek.olsak@amd.com>
Date: Tue, 17 May 2016 21:10:24 +0000 (+0200)
Subject: radeonsi: add a workaround for a bug in LLVM <= 3.8
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=51cf04cf0e4b348de7e920deff1dad3fb4e62407;p=mesa.git

radeonsi: add a workaround for a bug in LLVM <= 3.8

This is not directly applicable to stable and needs to be backported.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
---

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 6166403f549..3df78200ff3 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -556,6 +556,13 @@ static LLVMValueRef get_bounded_indirect_index(struct si_shader_context *ctx,
 	LLVMValueRef c_max = LLVMConstInt(ctx->i32, num - 1, 0);
 	LLVMValueRef cc;
 
+	/* LLVM 3.8: If indirect resource indexing is used:
+	 * - SI & CIK hang
+	 * - VI crashes
+	 */
+	if (HAVE_LLVM <= 0x0308)
+		return LLVMGetUndef(ctx->i32);
+
 	if (util_is_power_of_two(num)) {
 		result = LLVMBuildAnd(builder, result, c_max, "");
 	} else {